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Text File | 1990-03-09 | 18KB | 412 lines

.RR--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--!--! .PL 62 .LM 1 .RM 78 .MT3 .MB4 .HM1 .FM1 .PO10 .CW10 .SR2 .UJ0 .OJ0 .UL1 .heProcessor Devices 3/9/90 .foSCSI-2 draft proposed American National Standard 11-# Revision 10c .pn 1 .cp 30 .aw off .pm 0 11. Processor Devices .aw on .pm 3 .cp 20 .aw off .pm 0 11.1. Mode∞ fo≥ Processo≥ Devices .aw on .pm 3 ááThσ SCS╔ processo≥ devicσ i≤ ß targe⌠ witΦ thσ characteristic≤ oµ ß primar∙ ì computinτ device¼ typicall∙ ß persona∞ computer¼ minicomputer¼ mainframσ ì computer¼ o≥ auxiliar∙ computinτ devicσ o≥ server« SucΦ ß primar∙ computinτ ì devicσ i≤ ofteε calleΣ ß host« Thσ processo≥ devicσ receive≤ o≥ provide≤ ì packet≤ oµ datß a≤ requesteΣ b∙ thσ initiator« ááIε thσ SCS╔ processo≥ device¼ thσ targe⌠ accept≤ anΣ provide≤ thσ datß ì packet≤ transferreΣ accordinτ t∩ thσ command≤ oµ thσ initiator« Thσ initiato≥ ì anΣ thσ processo≥ devicσ arσ botΦ assumeΣ t∩ kno≈ thσ rule≤ b∙ whicΦ ì informatioε i≤ exchangeΣ betweeε them¼ ho≈ thσ informatioε i≤ interpreteΣ b∙ ì thσ processo≥ device¼ anΣ wheε i⌠ i≤ allowablσ t∩ exchangσ thσ information« ì Thesσ rule≤ arσ no⌠ specifieΣ b∙ thi≤ standard. ááThσ initiato≥ request≤ tha⌠ thσ processo≥ devicσ accep⌠ ß packe⌠ oµ datß b∙ ì transmittinτ ß SEN─ command« Thσ initiato≥ request≤ tha⌠ thσ processo≥ devicσ ì returε ß packe⌠ oµ datß b∙ transmittinτ ß RECEIV┼ command« ┴ COP┘ commanΣ caε ì als∩ bσ transmitteΣ t∩ thσ processo≥ devicσ t∩ reques⌠ tha⌠ i⌠ servσ a≤ ß cop∙ ì manager« Thσ actua∞ datß flo≈ caε bσ betweeε thσ processo≥ devicσ anΣ anothe≥ ì SCS╔ devicσ o≥ caε bσ betweeε tw∩ SCS╔ device≤ unde≥ contro∞ oµ thσ processo≥ ì devicσ actinτ a≤ ß cop∙ manager. ááIµ ß processo≥ devicσ temporaril∙ ha≤ n∩ resourcσ availablσ t∩ managσ ß datß ì packe⌠ froφ thσ initiator¼ ha≤ n∩ datß packe⌠ t∩ providσ t∩ thσ initiator¼ o≥ ì ha≤ n∩ resource≤ assigneΣ t∩ perforφ thσ operation¼ thσ devicσ ma∙ theε choosσ ì onσ oµ thσ followinτ responses║ áá1⌐ Terminatσ thσ commanΣ witΦ CHEC╦ CONDITIO╬ statu≤ anΣ thσ sensσ ke∙ NO╘ ì READ┘ witΦ thσ appropriatσ additiona∞ sensσ codσ fo≥ thσ condition« Thi≤ i≤ ì thσ appropriatσ responsσ t∩ ß TES╘ UNI╘ READ┘ command« áá2⌐ Disconnec⌠ unti∞ thσ necessar∙ resourcσ o≥ datß packe⌠ become≤ available¼ ì anΣ theε reconnec⌠ t∩ thσ initiato≥ anΣ resumσ thσ operation. áá3⌐ Terminatσ thσ commanΣ witΦ BUS┘ status. ááMorσ thaε onσ Logica∞ Uni⌠ caε bσ implementeΣ b∙ ß processo≥ device« ì Logica∞ Unit≤ caε servσ a≤ additiona∞ path≤ t∩ ß singlσ resource¼ and/o≥ eacΦ ì logica∞ uni⌠ caε servσ a≤ ß patΦ t∩ differen⌠ resource≤ withiε thσ device« ┴ ì singlσ logica∞ uni⌠ ma∙ als∩ servσ a≤ ß patΦ t∩ multiplσ resource≤ iµ thσ ì processo≥ devicσ caε interpre⌠ informatioε withiε thσ datß packe⌠ anΣ routσ ì thσ packe⌠ t∩ thσ appropriatσ resource« Iµ thσ logica∞ uni⌠ addresseΣ b∙ thσ ì initiato≥ doe≤ no⌠ havσ aε availablσ resourcσ o≥ datß packe⌠ associateΣ witΦ ì it¼ thσ processo≥ devicσ ma∙ choosσ t∩ trea⌠ thσ logica∞ uni⌠ a≤ aε invaliΣ ì logica∞ uni⌠ (seσ 6.5.3⌐ o≥ responΣ a≤ describeΣ iε thσ previou≤ paragraph. ááIµ thσ processo≥ devicσ determine≤ tha⌠ aε erro≥ o≥ unusua∞ conditioε ha≤ ì occurreΣ whilσ performinτ aε operatioε specifieΣ b∙ thσ content≤ oµ ß datß ì packet¼ thσ informatioε describinτ thσ conditioε i≤ normall∙ returneΣ a≤ ß ì par⌠ oµ ß datß packet« Iµ thσ processo≥ devicσ determine≤ tha⌠ aε erro≥ o≥ ì unusua∞ conditioε ha≤ occurreΣ whilσ executinτ thσ SCS╔ commanΣ froφ thσ ì initiator¼ thσ commanΣ i≤ terminateΣ witΦ ß CHEC╦ CONDITIO╬ anΣ thσ failure≤ ì arσ identifieΣ througΦ ß REQUES╘ SENS┼ command. .cp 12èááThσ SCS╔ processo≥ devicσ i≤ distinguisheΣ froφ ß SCS╔ communication≤ devicσ ì b∙ thσ fac⌠ tha⌠ thσ primar∙ destinatioε oµ thσ datß packet≤ i≤ withiε thσ ì targe⌠ device« ┴ SCS╔ communication≤ device¼ iε contrast¼ passe≤ thσ datß oε ì t∩ aε ultimatσ destinatioε outsidσ thσ targe⌠ througΦ ß network« Man∙ type≤ ì oµ device≤ ma∙ finΣ i⌠ convenien⌠ t∩ functioε a≤ processo≥ device≤ iµ n∩ othe≥ ì suitablσ SCS╔ devicσ typσ exist≤ anΣ iµ thσ packe⌠ exchangσ protoco∞ dictateΣ ì b∙ thσ processo≥ devicσ mode∞ meet≤ thei≥ functiona∞ requirements« Device≤ ì requirinτ totall∙ incompatiblσ protocol≤ anΣ commanΣ set≤ shoulΣ bσ examineΣ ì carefull∙ t∩ bσ surσ tha⌠ thσ incompatibilitie≤ arσ baseΣ oε functiona∞ ì requirements« Iµ the∙ are¼ the∙ shoulΣ bσ treateΣ a≤ vendo≥ uniquσ devicσ ì types. .cp 2 ááSevera∞ example≤ oµ processo≥ devicσ implementation≤ arσ provideΣ t∩ clarif∙ ì thσ rangσ oµ utilit∙ oµ thσ SCS╔ processo≥ device. .cp 10 .aw off .pm 0 11.1.1. Hos⌠ t∩ Hos⌠ Communication¼ SEN─ Only .aw on .pm 3 áá┴ hos⌠ system¼ (Hos⌠ A)¼ take≤ thσ initiato≥ rolσ anΣ select≤ ß processo≥ ì devicσ (Hos⌠ B)¼ transmittinτ ß packe⌠ t∩ Hos⌠ ┬ usinτ thσ SEN─ command« Thσ ì SEN─ commanΣ contain≤ aε operatinτ systeφ cal∞ tha⌠ request≤ datß froφ thσ ì loca∞ storagσ device≤ attacheΣ t∩ Hos⌠ B« Afte≥ performinτ thσ function≤ ì requireΣ b∙ thσ datß packet¼ Hos⌠ ┬ assume≤ thσ initiato≥ modσ anΣ select≤ ì Hos⌠ ┴ a≤ ß processo≥ devicσ anΣ use≤ ß SEN─ commanΣ t∩ transmi⌠ thσ requesteΣ ì datß bacδ t∩ Hos⌠ A« Hos⌠ ┴ thu≤ act≤ a≤ ß primar∙ compute≥ anΣ Hos⌠ ┬ a≤ ß ì specializeΣ datß serve≥ computer« Notσ tha⌠ thσ SEN─ commanΣ i≤ sufficien⌠ t∩ ì perforφ ß completσ transactioε iµ botΦ Hos⌠ ┴ anΣ Hos⌠ ┬ arσ capablσ oµ actinτ ì a≤ initiators« Thi≤ provide≤ thσ capabilit∙ oµ ß higΦ bandwidtΦ inte≥-ì communicatioε amonτ nearb∙ hos⌠ processors. .cp 10 .aw off .pm 0 11.1.2. Hos⌠ t∩ Hos⌠ Communication¼ SEN─ anΣ RECEIVE .aw on .pm 3 áá┴ hos⌠ systeφ (Hos⌠ A⌐ take≤ thσ initiato≥ rolσ anΣ select≤ ß processo≥ ì devicσ (Hos⌠ B)¼ transmittinτ ß packe⌠ usinτ thσ SEN─ commanΣ t∩ Hos⌠ ┬ ì containinτ instruction≤ abou⌠ aε operatioε t∩ bσ performed« Hos⌠ ┴ agaiε ì take≤ thσ initiato≥ rolσ anΣ send≤ thσ datß t∩ bσ useΣ b∙ Hos⌠ ┬ iε thσ ì operation« Hos⌠ ┴ theε assume≤ tha⌠ ß resul⌠ wil∞ bσ obtaineΣ consisten⌠ witΦ ì rule≤ understooΣ b∙ botΦ devices« Hos⌠ ┴ generate≤ ß RECEIV┼ commanΣ t∩ ì obtaiε thσ resul⌠ froφ Hos⌠ B« Iµ thσ resul⌠ i≤ no⌠ ye⌠ ready¼ Hos⌠ ┬ ma∙ ì disconnec⌠ unti∞ thσ calculatioε i≤ completσ anΣ thσ requesteΣ datß packe⌠ caε ì bσ returneΣ t∩ Hos⌠ A« Notσ tha⌠ Hos⌠ ┴ neeΣ no⌠ suppor⌠ targe⌠ modσ anΣ Hos⌠ ì ┬ neeΣ no⌠ suppor⌠ initiato≥ modσ t∩ successfull∙ completσ aε exchangσ betweeε ì thσ tw∩ devices. .cp 7 .cp 10 .aw off .pm 0 11.1.3. Hos⌠ t∩ Specia∞ Outpu⌠ Peripheral .aw on .pm 3 áá┴ specia∞ c∩-processo≥ devicσ whicΦ caε usσ thσ processo≥ devicσ commanΣ se⌠ ì i≤ ß higΦ performancσ graphic≤ displa∙ terminal« Thσ initiato≥ send≤ contro∞ ì anΣ datß packet≤ t∩ thσ displa∙ termina∞ tha⌠ contaiε thσ imagσ t∩ bσ ì displayed« Onl∙ thσ SEN─ commanΣ woulΣ bσ required« ┴ periphera∞ failurσ ì woulΣ bσ indicateΣ througΦ thσ norma∞ CHEC╦ CONDITIO╬ » REQUES╘ SENS┼ ì protocol« .cp 10è.aw off .pm 0 11.1.4. Hos⌠ t∩ Specia∞ Inpu⌠ Peripheral .aw on .pm 3 áá┴ seconΣ specia∞ c∩-processo≥ devicσ whicΦ caε usσ thσ processo≥ devicσ ì commanΣ se⌠ i≤ ß datß acquisitioε subsystem« SucΦ subsystem≤ ma∙ multiple° ì anΣ compac⌠ stream≤ oµ datß froφ man∙ sources« ┴ hos⌠ coulΣ contro∞ thσ datß ì acquisitioε mode≤ anΣ thσ selectioε oµ datß stream≤ b∙ transmittinτ contro∞ ì packet≤ t∩ thσ processo≥ devicσ usinτ thσ SEN─ command« Thσ hos⌠ coulΣ theε ì obtaiε thσ acquireΣ datß b∙ executinτ ß serie≤ oµ RECEIV┼ commands« Thσ datß ì acquisitioε devicσ coulΣ als∩ servσ a≤ aε initiator¼ selectinτ periphera∞ ì storagσ device≤ anΣ storinτ thσ compacteΣ acquireΣ datß therσ fo≥ late≥ acces≤ ì directl∙ b∙ thσ hos⌠ o≥ througΦ Hos⌠ t∩ Hos⌠ communicatioε protocols« ┴ ì periphera∞ failurσ woulΣ bσ indicateΣ througΦ thσ norma∞ CHEC╦ CONDITIO╬ » ì REQUES╘ SENS┼ protocol. .cp 54è.aw off .pm 0 11.2. Command≤ fo≥ Processo≥ Devices .aw on .pm 3 ááThσ command≤ fo≥ processo≥ device≤ shal∞ bσ a≤ showε iε Tablσ 1▒-1. .aw off .pm 0 .cp 40 Table 11-1: Commands for Processor Devices ============================================================================== Operation Command Name Code Type Section Pagσ ------------------------------------------------------------------------------ CHANG┼ DEFINITIO╬ 40Φ ╧ 7.2.1 COMPAR┼ 39Φ ╧ 7.2.2 COPY 18h O 7.2«3 COP┘ AN─ VERIFY 3Ah O 7.2.4 INQUIRY 12h M 7.2«5 LO╟ SELEC╘ 4CΦ ╧ 7.2.6 LO╟ SENS┼ 4DΦ ╧ 7.2.7 REA─ BUFFER 3Ch O 7.2«12 RECEIVE 08h O 11.2.1 RECEIVE DIAGNOSTIC RESULTS 1Ch O 7.2«13 REQUEST SENSE 03h M 7.2«14 SEND 0Ah M 11.▓.2 SEN─ DIAGNOSTI├ 1DΦ M 7.2«15 TEST UNIT READY 00h M 7.2«16 WRIT┼ BUFFER 3Bh O 7.2«17 ============================================================================== .aw on .pm 3 ááKey║ ═ ╜ CommanΣ implementatioε i≤ mandatory. áá ╧ ╜ CommanΣ implementatioε i≤ optional. áá ááThσ followinτ operatioε code≤ arσ vendo≥ specific║ 02h¼ 05h¼ 06h¼ 09h¼ 0Ch¼ ì 0Dh¼ 0Eh¼ 0Fh¼ 10h¼ 11h¼ 13h¼ 14h¼ 19h¼ C0Φ througΦ FFh« Al∞ remaininτ ì operatioε code≤ fo≥ processo≥ device≤ arσ reserveΣ fo≥ futurσ standardization. .cp 35è.aw off .pm 0 11.2.1. RECEIVE Command Table 11-2: RECEIVE Command ============================================================================== Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Byte | | | | | | | | | ============================================================================== 0 | Operation Code (08h) | -----|-----------------------------------------------------------------------| 1 | Logical Unit Number | Reserved | -----|-----------------------------------------------------------------------| 2 | (MSB) | -----|--- ---| 3 | Allocation Length | -----|--- ---| 4 | (LSB) | -----|-----------------------------------------------------------------------| 5 | Control | ============================================================================== .aw on .pm 3 ááThσ RECEIV┼ commanΣ (Tablσ 1▒-2⌐ request≤ thσ targe⌠ transfe≥ datß t∩ thσ ì initiator« Thσ content≤ oµ thσ datß arσ no⌠ defineΣ b∙ thi≤ standard. .cp 28 .aw off .pm 0 11.2.2. SEND Command Table 11-3: SEND Command ============================================================================== Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Byte | | | | | | | | | ============================================================================== 0 | Operation Code (0Ah) | -----|-----------------------------------------------------------------------| 1 | Logical Unit Number | Reserved ⁿ AEN | -----|-----------------------------------------------------------------------| 2 | (MSB) | -----|--- ---| 3 | Transfer Length | -----|--- ---| 4 | (LSB) | -----|-----------------------------------------------------------------------| 5 | Control | ============================================================================== .aw on .pm 3 .cp 2 ááThσ SEN─ commanΣ (Tablσ 1▒-│ request≤ thσ targe⌠ transfe≥ datß froφ thσ ì initiator. .cp 3 ááAε asynchronou≤ even⌠ notificatioε (AEN⌐ bi⌠ oµ onσ indicate≤ tha⌠ thσ datß ì t∩ bσ transferreΣ conform≤ t∩ AE╬ datß forma⌠ a≤ defineΣ iε Tablσ 1▒-4« ┴ ì SEN─ commanΣ witΦ aε AE╬ bi⌠ oµ onσ shal∞ onl∙ bσ issueΣ t∩ logica∞ uni⌠ zero. .cp 2èááAε AE╬ bi⌠ oµ zer∩ indicate≤ tha⌠ thσ datß t∩ bσ transferreΣ arσ vendo≥-ì specific. .cp 3 ááThσ transfe≥ lengtΦ specifie≤ thσ lengtΦ iε byte≤ oµ datß tha⌠ shal∞ bσ sen⌠ ì durinτ thσ DAT┴ OU╘ phase« ┴ transfe≥ lengtΦ oµ zer∩ indicate≤ tha⌠ n∩ datß ì shal∞ bσ sent« Thi≤ conditioε shal∞ no⌠ bσ considereΣ a≤ aε error. .cp 20 .aw off .pm 0 Table 11-4: SEN─ CommanΣ ¡ AE╬ Data Format ============================================================================== Bit| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Byte | | | | | | | | | ============================================================================== 0 ⁿ ReserveΣ ⁿ LUNTAR ⁿ ReserveΣ ⁿ LUNTR╬ | -----|-----------------------------------------------------------------------| 1 | ReserveΣ | -----|-----------------------------------------------------------------------| 2 ⁿ Reserved | -----|-----------------------------------------------------------------------| 3 | Reserved | -----|-----------------------------------------------------------------------| 4 toⁿ Sensσ Datß Bytσ (0) | - - -|- - - -| ε+┤ | Sensσ Datß Bytσ (n) | ============================================================================== .aw on .pm 3 áá┴ logica∞ uni⌠ targe⌠ (LUNTAR⌐ bi⌠ oµ zer∩ specifie≤ tha⌠ thσ asynchronou≤ ì even⌠ occurreΣ oε ß logica∞ unit« ┴ LUNTA╥ bi⌠ oµ onσ specifie≤ tha⌠ thσ ì asynchronou≤ even⌠ occurreΣ oε ß targe⌠ routine. ááIµ thσ LUNTA╥ bi⌠ i≤ zero¼ thσ logica∞ uni⌠ numbe≥ targe⌠ routinσ numbe≥ ì (LUNTRN⌐ fielΣ specifie≤ oε whicΦ logica∞ uni⌠ thσ asynchronou≤ even⌠ ì occurred« Iµ thσ LUNTA╥ bi⌠ i≤ one¼ thσ LUNTR╬ fielΣ specifie≤ oε whicΦ ì targe⌠ routinσ thσ asynchronou≤ even⌠ occurred. ááThσ sensσ datß byte≤ arσ defineΣ iε Tablσ ╖-35. .cp 20è.aw off .pm 0 11.3. Parameter≤ fo≥ Processor Devices .aw on .pm 3 .cp 10 .aw off .pm 0 11.3.1. Diagnostic Paramete≥s .aw on .pm 3 ááThi≤ sectioε define≤ thσ descriptor≤ anΣ page≤ fo≥ diagnostiπ parameter≤ ì useΣ witΦ processo≥ devices« ááThσ diagnostiπ pagσ code≤ fo≥ processo≥ device≤ arσ defineΣ iε Tablσ 1▒-5. .aw off .pm 0 .cp 15 Table 11-5: Diagnostiπ Page Codes ============================================================================== Page Code Description Section ------------------------------------------------------------------------------ ááá00h Lis⌠ oµ SupporteΣ Parameters Pagσ 7.3.1.1 01Φ ¡ 3Fh ReserveΣ (fo≥ al∞ devicσ typσ page≤) 40Φ ¡ 7Fh Reserved 80Φ ¡ FFh Vendo≥-specifiπ pages ============================================================================== .aw on .pm 3 .lm 1 .cp 5 .aw off .pm 0 11.3.2. Log Paramete≥s .aw on .pm 3 ááThi≤ sectioε define≤ thσ descriptor≤ anΣ page≤ fo≥ loτ parameter≤ useΣ witΦ ì processo≥ devices« ááThσ loτ pagσ code≤ fo≥ processo≥ device≤ arσ defineΣ iε Tablσ 1▒-6. .aw off .pm 0 .cp 25 Table 11-6: Log Page Codes ============================================================================== Page Code Description Section ------------------------------------------------------------------------------ ááá01h Buffer Over-Run/Under-Run Page 7.3.2.1 ááá07h Last n Error Events Page 7.3.2.3 ááá00h List of Supported Parameter≤ Page 7.3.2.5 ááá06h Non-Mediuφ Error Page 7.3.2.4 02h - 05h Reserved 08h - 2Fh Reserved 30h - 3Eh Vendo≥-specifiπ page≤ ááá3Fh Reserved ============================================================================== .aw on .pm 3 .lm 1 .cp20è.aw off .pm 0 11.4. Glossar∙ fo≥ Proces≤o≥ Devices .aw on .pm 1 host.é ┴ devicσ witΦ thσ characteristic≤ oµ ß primar∙ computinτ device¼ ì typicall∙ ß persona∞ computer¼ workstation¼ minicomputer¼ mainframσ computer¼ ì o≥ auxiliar∙ computinτ devicσ o≥ server. datß packet.é Thσ datß transferreΣ durinτ thσ DAT┴ I╬ phasσ oµ ß RECEIV┼ ì command¼ o≥ durinτ thσ DAT┴ OU╘ phasσ oµ ß SEN─ command« ┴ datß packe⌠ ofteε ì contain≤ informatioε a⌠ thσ beginninτ o≥ enΣ oµ thσ packe⌠ tha⌠ describe≤ thσ ì content≤ oµ thσ packet« ┴ datß packe⌠ migh⌠ contaiε contro∞ o≥ statu≤ ì informatioε fo≥ thσ destinatioε device. resource.é ┴ par⌠ oµ thσ devicσ requireΣ t∩ operatσ oε o≥ storσ thσ datß ì packet« ..end of section .paè